Characterization of triethanolammonium bromide mono-and dibenzoate as cationic surfactants

ABSTRACT

Novel series of triethanolammonium mono- and dibenzoate bromide cationic surfactants containing different alkyl chains were synthesized. Their surface parameters including, surface tension [gamma], critical micelle concentration [CMC], effectiveness [lambada pi[cmc]], maximum surface excess gamma and minimum surface area [A [min]] were caiculated at 25 degree sign C. Increasing the number of methylene groups in the hydrophobic chains [tails] increases the surface parameters, which decreases the surface tension of these surfactants in their solutions. Energetic parameters of micellization and adsorption of these surfactants in their solutions were also calculated at 25 degree sign C. The results of thermodynamic calculations showed the tendency of these surfactant molecules towards adsorption at the air/water interfaces rather than the micellization in the bulk of their solutions. The surface and energetic parameters were correlated to the ability of these surfactants towards adsorption at the interfaces